JP2008229726A - Roll grooving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roll grooving apparatus for pipes which is high in durability and excellent in tracking performance. <P>SOLUTION: This grooving apparatus is provided with a grooving roll and a back-up roll which are relatively displaced with a feed screw and, by improving the strength and durability of the feed screw, preventing its wear and improving torque performance, the grooving of a thicker pipe is made possible. The improved tracking performance is obtained by a special roll structure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to the field of roll grooving devices. In particular, the desired alignment between the grooving roll and the workpiece is achieved and maintained, thereby achieving and maintaining the tracking between the grooving roll and the workpiece so that the groove obtained by rotation is the workpiece. It relates to an improvement of such a device for making it perpendicular to the axis of the piece.

  The present invention can be used in particular with a portable roll groover adapted to interengage with a fixed pipe and moving around the pipe during a roll grooving operation. Thus, although the present invention will be described with respect to such a roll grooving device, the present invention is directed to the roll grooving device being fixed and the grooving pipe being rotated relative to the roll grooving device during the grooving operation. It should be understood that the present invention is also applicable to such a roll grooving apparatus.

  Roll grooving devices are well known and generally have a pair of housing members or support members that are displaceable relative to each other, the support members rotatably supporting a drive or backup roll and an idler or grooving roll, respectively. During the grooving operation, the pipe to be grooved is sandwiched between these rolls. These two rolls have an outer shape that meshes with each other. The drive roll is provided with a groove on the outer periphery, and the grooved roll is provided with a protrusion on the outer periphery, so that the pipes sandwiched between these rolls rotate relative to each other and the rolls are radially directed toward each other. A groove is formed in the periphery in accordance with the displacement. The drive roll is rotated by hand tools or drive motors depending on the type of roll grooving device.

  Often, the relative displacement between the roll supports is made by a threaded feed screw provided between the supports. This includes screw parts that are manually rotated by a tool such as a wrench or by hand. The roll supports are interengaged so as to be linearly or rotationally displaceable relative to each other, and in either case, the feed screw can be separated so that it is easy to pinch the pipe or pipe. In one direction and then in the opposite direction so that the roll engages the pipe. Thus, the pipe, backup roll and grooving roll are rotated relative to each other, and the lead screw is manually rotated in a direction so that the grooving roll is displaced toward the backup roll, thereby around the pipe. Grooves are gradually formed. When the desired groove diameter is reached, the relative rotation is stopped and the lead screw is reversed until a sufficient gap is formed between the two rolls to allow the grooved pipe to be removed therefrom. To be rotated.

  As is well known, it is necessary to ensure that the axis of the pipe and the grooving roll are properly aligned during the roll grooving operation so that the groove path is perpendicular to the pipe axis. If alignment is not good at the beginning of the roll grooving operation, the groove path will be helical with respect to the pipe axis, so that the pipe or device "walks" in a direction that axially separates the roll and pipe. "Walks". This tracking problem can be caused by the fact that the roll support is other than a lead screw, for example by hydraulic pressure as shown in U.S. Pat. No. 3,995,466 to Kunsmann, or U.S. Pat. No. 5,079,940 to Pulver et al. It can occur in the operation of any roll grooving device, including devices that are relatively displaced by a manual one using the disclosed pivoting lever arm. Many efforts have been made to provide roll grooving devices that are capable of self-tracking. For example, as disclosed in US Pat. No. 5,528,919 to McGrady et al., Teeth are provided on the outer periphery of the backup or drive roll, thereby biasing the pipe and grooving roll axially inward relative to each other. It is known to do. Another example is to support the pipe to be grooved at an angle with respect to the axis of the grooving roll as disclosed in the above-mentioned patent issued to Kunsmann, It is known to tilt the idler or grooving roll axis relative to the axis of the backup roll as disclosed in U.S. Pat. No. 2,975,819 and U.S. Pat. No. 4,404,747 to Elkin. As yet another example, as disclosed in US Pat. No. 5,279,143 to Dole, the outer surface of a backup or drive roll was shaped like a conical frustum and was granted to Costanzo et al. As disclosed in the above-mentioned patents, it is known to provide an auxiliary roller that engages the outer surface of a grooved pipe and whose axis is inclined with respect to the axis of the grooved pipe. ing.

  Self-tracking can be facilitated by configurations such as those described above, but these require additional and / or specially designed parts, thus increasing the manufacturing and maintenance costs of the roll grooving device. This will undesirably increase the cost of the device. Also, wear in feed screws is often a problem in devices that use feed screws to displace grooving rolls relative to each other. This is because the possibility of jamming increases due to wear of the feed screw, and an undesirably large input torque is required. In addition, dropping the roll grooving device can damage the lead screw, but such device dropping is common on site. Furthermore, the force required to groove a thick-walled pipe, such as a 5 inch (12.7 cm), Schedule 40 pipe, deflects the axis of the backup or drive roll to maintain proper tracking. It may have an adverse effect. Thus, until now it has not been possible to use only one basic grooving unit and grooving the entire pipe size, for example from 1.25 inches (3.18 cm) to 12 inches (30.5 cm). It was possible.

  In accordance with the present invention, an improved grooving device is provided that minimizes or solves the above and other problems found in prior grooving devices. According to one aspect of the present invention, the grooving device of the present invention includes a grooving roll and a backup roll that are relatively displaced by a feed screw, which improves the strength and durability of the feed screw, prevents its wear, and reduces torque. It has features that improve performance and enables grooving of thicker pipes. Also in this respect, the lead screw is coupled to the two roll support portions at both ends thereof, and has a procedure for minimizing or eliminating the lateral thrust as seen in the conventional lead screw. Direct operation by applying force to the feed screw is possible. Another feature of the lead screw is a release mechanism that releases one or two support members relative to the lead screw when subjected to an impact, such as when the device is dropped. In the conventional apparatus, such a force of impact is directly applied to the feed screw and the thread groove of the cooperating grooving device, and there is a problem that the screw is worn or damaged, and the operation becomes difficult. This increased the cost of maintenance and replacement and reduced the life of the lead screw components.

  According to another aspect of the present invention, improved tracking performance is provided by one or more features relating to the structure of the backup or drive roll and the grooving roll and the roll support member during the grooving operation. In this regard, in particular, the backup or drive roll is provided with a knurling structure that minimizes the twisting of the pipe relative to the backup or drive roll during the roll grooving operation. Another feature regarding tracking is to support the grooving roll so that the axis of the grooving roll is at an angle to the axis of the backup roll, and with regard to performing roll grooving of certain pipes, A taper is provided in the groove projection of the groove roll so that the pipe and the groove roll are displaced inward in the axial direction with respect to each other during the roll groove operation. Yet another tracking feature of the present invention is to support the axially outer end of the backup roll and prevent the axially outer end of the backup roll from deflecting during the roll grooving operation. This part is subject to a large force, but if deflection occurs, the proper orientation or alignment between the rolls and the pipes cannot be achieved, resulting in poor tracking. The support structure described above can handle a wide range of pipes from, for example, 1-1 / 4 inches (3.18 cm) to 12 inches (30.5 cm) with a single roll grooving device. In the past, two or more devices were required to cover such a wide range of pipe sizes.

  An object of the present invention is a roll grooving device of the type including a feed screw for relative displacement of a grooving roll and a backup roll, which applies a force against the feed screw during the roll grooving operation. An improved roll grooving device is provided.

  Another object of the present invention is to enable roll grooving of thick wall pipes while reducing lead screw wear, reducing the required input torque and jamming in roll grooving, and improving the strength and life of the screw. It is providing the roll grooving device of the above type provided with the feed screw mechanism.

  Yet another object of the present invention is to provide an impact-driven release device as described above, which protects the lead screw and the parts of the interlocking device in cooperation with it from being damaged by an axial impact on the lead screw. It is to provide a type of roll grooving device.

  It is a further object of the present invention to provide a roll grooving device with improved self-tracking characteristics.

  Yet another object of the present invention is to provide a backup roll for a roll grooving device with a knurling arrangement that facilitates tracking while minimizing the cost to achieve it. is there.

  Still another object of the present invention is to provide a grooving roll structure with improved self-tracking characteristics.

  Still another object of the present invention is to provide a grooved roll mount structure for improving self-tracking characteristics in a roll groover.

  Still another object of the present invention is to provide a roll grooving apparatus having a structure for supporting the axially outer end of a backup or drive roll so as not to bend even when a large roll grooving force is applied. Is to provide.

  Yet another object of the present invention is to provide a roll grooving unit capable of roll grooving over a wider range of pipe sizes than was possible with previous devices.

  These and other objects will be clarified and / or described in more detail in the description of the preferred embodiment of the present invention illustrated in the accompanying drawings.

  The features, objects, and advantages of the present invention will become more apparent from the following description of preferred embodiments with reference to the accompanying drawings.

  In the following, embodiments will be described in more detail with reference to the drawings, but what is shown is only for the purpose of illustrating a preferred embodiment of the invention and is not intended to limit the invention. FIGS. 1-4 show a first support in the form of a housing 12 and an arm 14 in the form of an arm 14 attached to the housing 12 using a pivot pin 16 for rotational displacement in both directions about the pivot shaft 18. A roll grooving device 10 having two supports is illustrated. The housing 12 supports a backup or drive roll 20 for rotation about a rotation axis 22 parallel to the pivot axis 18, and the arm 14 drives an idler or grooved roll 24 for rotation about the rotation axis 26. To support. According to one aspect of the present invention, as will be described in more detail below, the rotating shaft 26 is fixed with respect to the arm 14 and forms a small angle with respect to the rotating shaft 22. The rolls 20 and 24 are adjusted to receive the wall of the pipe P therebetween, and as will be described in more detail below, the associated rotation of the roll and pipe and to the roll 20 during such associated rotation. Female and male grooving rotation is provided, respectively, such that the flutes rotate cooperatively around the pipe P in response to the radial displacement of the roll 24.

  In the preferred embodiment shown in FIGS. 1-4, the backup or drive roll 20 is adjusted to drive about the axis 22 and for this purpose in a manner that will be described in more detail below. At the axially outer end 28 of the drive shaft 30 that is pivotally supported by bearings 32 and 34, respectively, proximate the front and rear ends of the housing, such as extending through the housing 12. It is attached. The drive shaft 30 is provided with a drive gear 36 that is suitably fixed for rotation therewith, that is, a crank 38 such that the drive shaft 30 passes through a pinion gear reducer (not shown). To adjust for rotation. That is, during manual rotation of the crank 38, the rotation of the drive shaft 30 and the backup roll 20, and as described in more detail below, during the grooving rotation operation, such as grooving rotation, the apparatus 10 Should be understood to cause the rotation of the drive roll 20 with the insertion of the pipe P between it and the drive roll 24.

  As can be seen in FIG. 3, the reaction arm 14 has a first end pivotally fixed to the housing 12 by a pin 16 so that the pivot shaft 18 is offset upward and laterally with respect to the roll shaft 22. Part 40. The arm extends laterally across the housing 12 and the roll axis 22 and has a second end such that there is a lateral offset opposite the pivot axis 18 with respect to the roll axis 22. As will be described in more detail below, the end 42 of the arm 14 is interconnected with the housing 12 through a feed screw mechanism 44 that directs the grooving roll 24 radially toward the drive roll 20. The reaction arm end 42 further restricts the displacement of the arm so that the grooving roll 24 rotates the groove of the desired diameter on the pipe P. Thus, an adjustment screw 46 is provided so as to face the backup roll 20.

  In the embodiment illustrated in FIGS. 1-4, the backup or drive roll 20, also illustrated in FIG. 7, provides an axial outer end 20 a and inner end 20 b and a peripheral groove 48. It has an annular outer surface with a second portion defined by one portion and surfaces 50 and 52 located on the outer and inner sides, respectively, in the axial direction of the groove. The outer end 20a of the roll 20 is defined by a support shaft portion 54 with a spring clip groove 56, the purpose of which will be described below, and the roll inner end 20b is preferably used during the roll grooving operation. It is defined by an annular flange 58 that extends radially outward from the surfaces 50 and 52 to provide a joint for placement such that the pipe P is grooved against the grooving roll. Further in accordance with this embodiment, as best seen in FIGS. 1 and 4, the roll 20 has an axial bore 60 therethrough, the support for the roll being axially outward of the drive shaft 30. Received at a support member 62 provided at the end 28 and removably attached to the housing 12 to support the inner end of the perforation 60 of the roll 20 and the outer end of the roll. In more detail in this regard, the support member 62 includes a base portion 64 for removably attaching the support member to the front wall through the housing 12 using a pair of socket cap screws 66, a sleeve portion 68, The sleeve portion is supported in the outer axial direction of the housing 12, and includes a bridging portion 70 that is coaxial with the rotation shaft 22. The sleeve portion 68 is preferably adjusted to rotatably support and receive the support shaft portion 54 of the roll 20 with a bearing sleeve 72 interposed therebetween. Such support limits the deflection of the rotating shaft 22 to correspond to the strong force acting on the backup roll 20 during the roll grooving operation. Without such support on the axially outer side of roll 20, 4 inches Sch. 40-12 using component parts of a roll grooving device sized to handle 1.25 "to 3.25" Sch. 40 pipes. Such deflection can occur with respect to roll grooving of inch Sch. 10 pipes. That is, by using the structure of the backup roll 20 in which the support member 68 and the axially outer end are supported by the support member, the entire range from 1.25 inches to 12 inches can be handled by a single roll groove base unit. It becomes possible. As will become apparent below, the support member 62 is adjusted to be removed from the housing 12, and the backup roll 20 is replaced with a similar roll without the support shaft portion 54 so that the device is 1.25 inches. Work on roll grooving of pipes with thin walls of ~ 3.50 inches Sch.40.

  It should be understood that for the deflection of the rotating shaft 22 as described above, the support of the roll 20 facilitates the desired tracking with respect to the roll grooving of the thick walled pipe. With respect to mounting the support member 62 and roll 20 to the housing 12, the support shaft portion 54 is introduced through the bearing sleeve and sleeve portion 68 and the rear component is recessed at the axially outer end of the support shaft portion 54. The roll 20 is first assembled with the support member by internal interlocking in the axial direction through the use of a spring clip 74 as received. Next, the axially inner end of the roll 20 is introduced into the outer end 28 of the drive shaft 30 and extends through the perforations 60 and into the threaded internal interlock of the outer end 28 of the drive shaft 30. The drive roll is fixed to the drive shaft 30 by a socket cap screw 76. The cap screw 66 is then introduced through the hole 78 and thus into the base portion 64 of the support member and into the threaded hole 80 and thus into the front wall of the housing 12, thereby supporting it. The member 62 is fixedly attached to the housing.

  As described above and as understood from FIGS. 5, 8 and 10, the support member 62 and roll 20 are removed from the housing 12 to replace a similar backup roll, indicated at 20A in the rear view, with a thin wall. It may be attached to the axially outer end 28 of the drive shaft 30 in order to accommodate this roll grooving. As will be appreciated from the foregoing description, roll 20A has an axial bore (not shown) for receiving outer end 28 of shaft 30, and a screw for securing roll 20 to the drive shaft. The roll 20A is secured to the drive shaft by a socket cap screw similar to 76 but shorter.

  As can be seen from FIGS. 4 and 9, the idler or grooving roll 24 is a mated profile with respect to the backup roll 20, and thus the axial outer end 24a and inner end 24b, respectively, the face of the roll 20 The portions 50 and 52 and the surface portion annular surface portions 82 and 84 positioned on the surface portions 50a and 52a of the roll 20a, and the surfaces 82 and 84, are on the recess 48 of the roll 20 or the recess 48a of the roll 20a. And an annular rotational projection 86 that extends radially outwardly. The grooving roll 24 is mounted on the reaction arm 14 with a pin or shaft component 88 to rotate there and a bearing component 90 is inserted between the shaft and the grooving roll. In accordance with another aspect of the present invention, the rotating protrusion 86 includes an outer rotating surface 92 having an axial inner end 92a and an outer end 92b. In most roll grooving operations, the surface 92 is parallel to the axis 26 of the grooving roll. However, for a 4 inch to 6 inch (10.16 cm to 15.24 cm) Schedule 40 pipe, the surface 92 has a shaft 26 that converges with respect to the axis in the direction from the outer end 92a to the inner end 92b. Is tapered at an angle x. This taper is preferably 2 °, and as can be seen from the structure of the relationship between the grooving roll protrusion 86 and the backup roll recess 48 as shown in FIG. A tapered surface 92 biases the pipe axially inward against the flange 58 of the backup roll in order to obtain the desired tracking when engaging the outside of the pipe inserted between the rolls. The taper at the rotating surface of the grooving roll also compensates for the bending deflection that can occur when strong forces in thick wall roll grooving are applied.

  According to another aspect of the invention, as shown in FIGS. 7 and 8, the surface portions 50 and 52 of the backup roll 20 and the surface portions 50a and 52a of the roll 20A are preferably teeth in the form of a diamond donor ring. And the axially inner and outer surfaces relative to the inner end of the corresponding roll have axial lengths L1 and L2, respectively. The length of L2 is shorter than the length of L1 in order to pre-exclude misalignment of the roll-grooved pipe with respect to the grooving roll during the initial state of the roll grooving operation. More particularly in this regard, the grooving roll is initially engaged with the pipe and roll grooved, and is on the surface portion 52 or 52a when the pipe material is placed in a groove or recess in the backup roll. The pipe portion tends to spread radially outward from the surface, thus reducing the contact area between the roll surface and the pipe. Thus, if the initial length L2 is equal to the length L1, twisting or misalignment is facilitated by contact loss between the pipe and the surface 52 or 52a. Thus, by making the length L2 shorter than the length L1, the spread makes the regions of the surfaces 50 and 52 or the joints between 50a and 52a and the pipe equal to each other, thereby minimizing misalignment or Excluded and improved tracking. It will be appreciated that although diamond donor rings are preferred, alternative tooth configurations may be provided. For roll grooving of the full range of pipe sizes from 1-1 / 4 inch to 12 inch (3.18 cm to 30.5 cm), the length L1 is the slip between the backup roll and the pipe being grooved or For example, L1 is 0.354 inches (9 mm) to 0.383 inches (9.73 mm). Further, as an example of various pipe sizes, the length L1 of the backup roll for roll grooving is 1-1 / 4 inch (3.18 cm) to 1-1 / 2 inch (3.81 cm). And for Schedule 40 steel pipe, 0.380 inch (9.652 mm), 2 inch (5.08 cm) to 6 inch (15.24 cm), Schedule 10 steel pipe, and 2 inch (5.08 cm) to 3-1 / 2 inches (8.89 cm) for Schedule 40 steel pipes 0.358 inches (9.093 mm), 4 inches (10.16 cm) to 6 inches (15.24 cm) for Schedule 40 steel pipes 0.354 inches (8.992 mm), 8 inches (20.32 cm) to 12 inches (30.50 cm) If 0 steel is 0.383 inches (9.728mm), and 2 inches (5.08 cm) 0.358 inches in the case of copper tube 8 inches (20.32cm) (9.09mm). The length of L1 and L2, in particular the length of L1, is determined in part by the shape of the groove, preferably L1 is as long as possible and L2 is possible at the structural and functional limits As short as possible. Thus, it will be appreciated that different structural relationships than those previously described can be provided to achieve the desired control over misalignment.

  According to still another aspect of the present invention, as shown in FIG. 10, the grooving roll 24 corresponding to the entire area of the pipe size to be grooved has its axis 26 with respect to the axis 22 of the backup roll. It is attached to the reaction arm 14 so as to have an angle y in a cross section that crosses the reference plane passing through the axis 22 of the backup roll. Here, the reference plane is vertical in the component direction shown in FIGS. As further understood in FIG. 10, because of the angle y, the rotating ridge 86 of the grooving roll is at the same angle y1 relative to the rotating groove 48 of the backup roll 20. The angle y can be between 1 ° and 2 °, preferably 2 °. As described above, better tracking is realized by the fact that the axis of the grooving roll has an angle with respect to the axis of the backup roll in relation to the transverse and reference planes.

  Each of the features described above, i.e., the provision of knurled surfaces of different lengths, the taper on the rotating surface of the grooving roll, and the grooving roll mounted at an angle to the backup roll, individually act. Even so, there will be some improvement in alignment and tracking. However, the knurling and grooving roll mounting features can be combined for roll grooving for a wide range of pipe sizes as described above for optimal results, and in addition, thickness Tapered in connection with roll grooving of 4 inch to 6 inch (Schedule 40 pipe) 4 to 6 inches (10.16 cm to 15.24 cm) support for the outer end of the backup roll for wall groove grooving. It is also possible to use a grooving roll having a rotating surface.

  According to another aspect of the present invention, as best seen in FIGS. 2 and 6, the lead screw mechanism 44 described above is incorporated into the housing 12 and reaction arm 14 and is structurally related. , Prevents lateral thrust from being applied to the feed screw during the roll grooving operation, and protects the feed screw components from damage caused by, for example, the impact resulting from the fall of the roll grooving device. More specifically in this regard, the lead screw mechanism includes a lead screw element 100 having an upper end 102 and a lower end 104, respectively, in the direction of the apparatus shown in FIG. The upper end 102 includes a tool head 106 having a non-cylindrical opening 108 in the internal axial direction to receive a suitable tool such as a ratchet spanner in which the lead screw is rotatable relative to the lead screw shaft 110. The tool head 106 further has a pair of openings 112 on either side therethrough for receiving a ratchet spanner ball detent for the purpose of holding the rear of the lead screw. The feed screw 100 further includes a shaft portion 114 that extends in the axial direction from the inner end portion of the tool head 106 to the lower end portion 104 of the feed screw. Further, the shaft portion 114 includes a non-threaded shank portion 116 that extends downward in the axial direction from the tool head 106 and a screw-type shaft portion 118 that extends from the shaft portion 116 of the feed screw to the lower end portion 104. An upper end portion of the feed screw 100 is rotatably mounted on the reaction arm 14 using a rotation pin 120 having a rotation shaft 122, and a lower portion of the feed screw is formed using a rotation pin 124 having a rotation shaft 126. Ends are pivotally interconnected with the housing 12. The pivot pin 120 is provided with a hole 128 extending laterally through the pin to receive and rotatably support an unthreaded portion of the lead screw. The pivot pin 124 is also provided with a threaded hole 130 that extends laterally to thread and engage the threaded portion 118 of the lead screw. Thus, reverse feed screw rotation relative to the shaft 110 causes the reaction arm to reposition toward or away from the housing 12, thus displacing the grooving roll 24 radially toward or away from the backup roll. You will understand that. Since the feed screw 100 can be rotated with respect to both the housing 12 and the reaction arm 14, it should be displaced so as to be engaged with the pipe sandwiched between the grooving roll and the backup roll during the roll grooving operation. When the lead screw rotates, no lateral thrust is generated on the lead screw. Of course, such rotational movement of the lead screw may be enabled by holes 132 and 134 that are extended in the housing 12 and reaction arm 14 respectively, through which corresponding portions of the lead screw shaft extend. You will understand.

  As noted above, the depth to which the screw 46 is adjusted is adjusted to limit the repositioning of the reaction arm 14 toward the housing 12. As such, the repositioning of the grooving roll 24 toward the backup roll determines the depth of the groove rotated in the pipe, i.e., the diameter of the groove. For this purpose, the adjusting screw 46 has a hole 138 extending in the lateral direction via the rotation pin 120, a screw shaft 136 meshing with the inside so as to be screwed therein, and an upper end of the shank 136. And a tool head 140 provided with a non-cylindrical recess for receiving a suitable tool that is rotatable relative to it. A lower end portion 144 of the shaft portion 136 exists on the rotation pin 124 and strikes to limit the rearrangement of the reaction arm toward the housing 12. Thus, for a given pipe roll grooving, the initial clearance between end 144 and pin 124 can be adjusted to determine the depth of the groove to be rotated in the pipe.

  The housing 12 includes a handle 146 whereby the roll grooving device is adapted to be transported from one position to another, and generally in such transport the feed screw and adjustment screw are the housing. The adjustment screw end 144 is positioned sufficiently away from the pivot pin 124 with respect to the pivot pin 124 on the twelve. According to yet another aspect of the invention, the lead screw and reaction arm are adapted to be relatively displaceable relative to each other in the axial direction of the lead screw in response to an impact. If this is not the case, the impact will result in undesired and potentially damaging forces being applied to the hole 130 and the lead screw thread. In particular, as shown in FIG. 6, the pivot pin 120 is provided with a hole 148 extending in the axial direction, and the non-threaded portion 116 of the feed screw body portion is provided with an annular recess 150 continuous in the circumferential direction. , And this portion is located in the hole 148 when the tool head 106 engages the pivot pin 120. The end of the bore 148 extending to the axially outer end of the pivot pin 120 is threaded to receive a ball detent insertion housing 152 whose outer surface is threaded, and the housing 152 is detent ball 154. And the spring 156 is supported, and the ball 154 is urged toward the recess 150 along the axial direction of the pivot pin. Therefore, as will be understood, when a downward impact is applied to the reaction arm 14 in FIGS. 2 and 6, the detent ball 154 is displaced outward in the radial direction of the concave portion 150, thereby releasing the reaction arm 14 and On the other hand, it can be displaced in the range determined by the gap between the adjusting screw end 144 and the pivot pin 124 in the axial direction along the body 114. As will be further understood, such release between the reaction arm and the lead screw causes the lead screw thread on the barrel 118 and the thread groove in the pivot pin hole 130 to be axial with respect to each other. Can protect against potential breakage due to applying force in the direction.

  While the above description emphasizes the structure of the components of the preferred embodiment of the present invention and the structural interrelationships between these components, many modifications can be made to the disclosed embodiments and the principles of the present invention may be considered. It should be understood that other embodiments can be made without departing. Accordingly, it is to be understood that the above description is intended to be illustrative of the invention and should not be taken as limiting.

It is a disassembled perspective view of the roll groove forming apparatus based on this invention. It is a perspective view of the state which assembled the components of FIG. FIG. 3 is an elevational view of the roll grooving apparatus of FIG. 2, showing the pipe being grooved between the drive and grooving rolls. FIG. 4 is a cross-sectional view taken through the backup and grooving roll along line 4-4 of FIG. FIG. 6 is an elevation view showing a roll grooving device using another embodiment of the drive roll according to the present invention with the outer end support of the drive roll removed. FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 5 showing the feed screw and groove depth adjustment screw of the apparatus. FIG. 3 is a side elevation view of a backup or drive roll according to the present invention. FIG. 4 is a side elevation view of another backup or drive roll according to the present invention. FIG. 3 is a side elevation view of a grooving roll according to the present invention. FIG. 6 is a cross-sectional view taken through the backup and grooving roll along line 10-10 of FIG.

Explanation of symbols

10 Roll Grooving Device 12 Housing 14 Arm 20 Drive Roll 24 Grooving Roll 38 Crank 44 Feed Screw Mechanism 46 Adjustment Screw 48 Recess 86 Rotating Projection
P pipe

Claims (28)

A grooving roll and a drive roll, means for supporting the grooving roll and the drive roll for rotation about first and second axes, respectively, and rotating the drive roll about the second axis Drive means, and means for causing the grooving roll and the drive roll to approach and move away from each other in the radial direction, the grooving roll having a roll protrusion extending in the circumferential direction, and the drive In a roll grooving device in which the roll has an axially outer end and a roll groove extending in the circumferential direction,
The apparatus wherein the means for supporting the grooving roll and the drive roll includes means for rotatably supporting the outer end of the drive roll about the second axis. The means for supporting the grooving roll and the drive roll has a housing, and the means for supporting the outer end of the drive roll includes a support member removably attached to the housing. The apparatus of claim 1. The means for rotating the drive roll includes a drive shaft which is rotatably supported in the housing so as to protrude from the housing and which is to provide the second axis; An outer end has a support shaft that is coaxial with the second axis, and the support member rotatably supports the support shaft and has sleeve means for receiving it. The apparatus according to claim 2. The support member has a base portion for mounting the support member on the housing, and the sleeve means is spaced axially outward from the base portion and via a bridge portion The apparatus of claim 3, wherein the apparatus is supported by the base portion. In a roll grooving device for forming a groove in a pipe,
A driving roll;
First support means for supporting the drive roll for rotation about a drive roll axis;
Second support means mounted on the first support means so as to be pivotable about a pivot axis parallel to the drive roll axis;
A grooving roll mounted on the second support means for rotation about a grooving roll axis;
The second support means and the grooved roll attached to the support means have a lead screw axis, and the grooved roll attached to the support means is spaced apart from the drive roll in the radial direction. A feed screw member having first and second axially opposite ends engaging the first and second support means, respectively, so as to be able to rotate about a feed screw axis to be displaced about; Have
The second end portion of the feed screw member includes means for rotating the screw member, and the feed screw shaft is inclined with respect to a plane including the drive roll axis and the grooved roll axis. So that the second end of the screw member is closer to the plane than the first end. 6. The means according to claim 5, further comprising means mounted on the second support means separately from the feed screw member to limit displacement of the grooving roll toward the drive roll. Equipment. The means for limiting the displacement of the grooving roll includes an adjustment screw having an adjustment screw axis, the adjustment screw changing the limit of movement of the grooving roll toward the drive roll, The apparatus of claim 6, wherein the apparatus is rotatable relative to the second support member about an adjustment screw axis. The pin member is pivotally engaged with the first support member so that the first end of the feed screw member can rotate about a pin axis perpendicular to the feed screw axis. 8. The apparatus of claim 7, wherein the adjustment screw has an end that engages the pin member to limit the movement of the grooving roll toward the drive roll. The first pin member rotates the first end of the feed screw member around the first pin axis perpendicular to the feed screw axis. The second end of the lead screw member is movably engaged, and can rotate about a second pin axis that is parallel to the first pin axis. The device according to claim 5, wherein the device is rotatably engaged with the second support member via a pin member. The first end portion of the feed screw member is screwed with the first pin member, and the second end portion of the feed screw member is with respect to the second pin member. 10. The device according to claim 9, wherein the device is engaged so as to be able to rotate, but not displaced in the axial direction. The said 2nd support means has a means for releasing the said 2nd edge part of the said lead screw member so that it can slide to an axial direction with respect to the said lead screw member. Item 10. The apparatus according to Item 10. 12. The apparatus of claim 11, wherein the release means includes spring biased detent means disposed between the second end of the lead screw member and the second support member. The detent means includes a circumferential groove provided at the second end of the feed screw member, and a spring biasing ball supported by the second support member for releasably engaging with the groove. 13. The device according to claim 12, comprising: The spring biasing ball is supported in a passage provided in the second pin member so as to be coaxial with the second pin axis. apparatus. An adjustment screw separate from the adjustment screw attached to the second support means and having an adjustment screw axis parallel to the feed screw axis; In order to limit the movement toward the drive roll, it has an end that is rotatable relative to the second support means about the adjusting screw axis and engages the first support member. The apparatus according to claim 12. The adjusting screw is screwed to the second pin member, and the end portion of the feed screw member is engaged with the first pin member, and the driving of the grooving roll is performed. 16. A device according to claim 15, characterized in that it limits the movement towards the roll. The detent means is coaxial with the second pin axis for releasably engaging the circumferential groove provided at the second end of the feed screw member with the groove. 17. The apparatus of claim 16, further comprising a spring biased ball supported in a passage provided in the second pin member. In a roll grooving device for forming a groove in a pipe,
A driving roll;
First support means for supporting the drive roll for rotation about a drive roll axis;
Second support means mounted on the first support means so as to be pivotable about a pivot axis parallel to the drive roll axis;
A grooving roll mounted on the second support means for rotation about a grooving roll axis;
The second support means and the grooving roll attached to the support means are displaced about the pivot so as to move the grooving rolls close to and away from each other in the radial direction with respect to the drive roll. A feed screw means provided between the first and second support means,
The feed screw means comprises a feed screw member having a feed screw axis and having first and second ends opposite to each other in the axial direction, wherein the first end comprises a screw portion, The second end portion is cylindrical, and can be rotated with respect to the second support means about the feed screw axis. The first support means is engaged with the second support means so as to be slidable in the axial direction with respect to the second end portion toward the first end portion. A device comprising means for releasably engaging the second end and the second support means so as to prevent an axial direction towards one end. 19. The apparatus of claim 18, wherein the release means includes spring biased detent means provided between the second end of the lead screw member and the second support means. The detent means includes a circumferential groove provided at the second end of the feed screw member, and a spring biasing ball supported by the second support member for releasably engaging with the groove. 20. The device according to claim 19, comprising: The second end portion of the feed screw member is rotatably engaged with the second support means via a pin member having a pin axis perpendicular to the feed screw axis, and the spring biasing ball 21. The apparatus according to claim 20, wherein is supported in a passage provided in the pin member so as to be coaxial with the pin axis. 21. The means for limiting the movement of the grooving roll toward the drive roll, supported by the second support means, separately from the feed screw member. Equipment. The means for limiting the displacement of the grooving roll includes an adjusting screw having an adjusting screw axis that is parallel to the feed screw axis, the adjusting screw going to the drive roll of the grooving roll. 23. The apparatus of claim 22, wherein the apparatus is rotatable relative to the second support member about the adjustment screw axis to change a limit of motion. The first pin member rotates the first end of the feed screw member around the first pin axis perpendicular to the feed screw axis to the first support means. The second end of the lead screw member is movably engaged, and can rotate about a second pin axis that is parallel to the first pin axis. The pin member is rotatably engaged with the second support means, and the spring biasing ball is in the second pin member so as to be coaxial with the second pin axis. The adjusting screw has an end engaged with the first pin member to limit the movement of the grooving roll toward the drive roll, which is supported in a provided passage. 24. The apparatus of claim 23. The first support via the first pin member so that the first end of the feed screw member can rotate about a first pin axis perpendicular to the feed screw axis. The second end of the feed screw member is rotatable about a second pin axis that is parallel to the first pin axis. 21. The device according to claim 20, wherein the device is rotatably engaged with the second supporting means via a second pin member. The first end portion of the feed screw member is screwed with the first pin member, and the second end portion of the feed screw member is with respect to the second pin member. 26. The device according to claim 25, wherein the device is engaged so as to be able to rotate, but not displaced in the axial direction. 27. The spring urging ball is supported in a passage provided in the second pin member so as to be coaxial with the second pin axis. apparatus. The first pin member rotates the first end of the feed screw member around the first pin axis perpendicular to the feed screw axis. The second end of the lead screw member is movably engaged, and can rotate about a second pin axis that is parallel to the first pin axis. The second support member is pivotally engaged with the second support member via the pin member, and the adjustment screw is engaged with the second pin member, and the grooved roll moves toward the drive roll. 8. The apparatus of claim 7, wherein the end of the adjustment screw engages the first pin member to define a limit.

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